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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df0e253293b5ec5a8fdd004dcec4f0c9dbbeabae8770a6353264f53154db4af7' 
  AND token = 'nvWmd9l1CRPvA+5jaB2hnSEqvMD3iPdzSkedvsLK4Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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