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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9977ec258c29dda9e2fb2cb507515c3723352788df5ae4b8c22ca99128771155' 
  AND token = 'lUaM0xapyJXX1pFdUlpGjrJJm8asOMs3tGutwjBh4tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}