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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34799369abe7a7dda92e7195b177feb3a50ea8960d7d56f7342f0db9d5173168' 
  AND token = 'mzuD7i6FEbMzxdSjfdQ9jCUkconez9NbX6u5BBBGfCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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