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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c9308bf886de40545d980d64e65da398d5f4a95d8e22044af58296f5281767' 
  AND token = 'Ptvm6xLpr3jm/Pc326vCc3PKfIJNpjdEIomBc2ldDy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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