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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e68c08e7dfdd925a9cce4b0aae7f523ad0ba0f0f0d125e5b390aa0240a852f' 
  AND token = 'nqnyTqDG9WNF2QxVFdq5JpYrKO/axTs2M4c+t7SJF74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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