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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91dffebed358d408f2b726529cd690600a6938661ef7e60214956ee45904acd1' 
  AND token = 'e1z4LAktRBP6nfy0Jj7rBE71BMlMucpD/wz96H1ORbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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