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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ccb462536c1df7365ab280b912c521be99f722221ecce5abc38714d404551d' 
  AND token = '2BCRgSOhZADpoOAmoknpiudoasK8zsb5uknHtQC++zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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