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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfdd2a0ad4646c89c7171b8fa16c36797780a74984b5ab083205451c84bdd3b8' 
  AND token = 'r6SQJ3O9bYjQI2Aorpn1Enj3ERSlhgCNW+S5El6r7Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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