SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44748e7250d7822942479a9cb7cb20cc1b668dac540e0145530b0793cbfdcb97' 
  AND token = 'hQ0VgRPDZYSQwJuSHB6seqcXjo9aluOhfJc5C/X2p2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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