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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b400564daf683834845573f876b1dadb13a4d4d60654d4400ac826678df8676e' 
  AND token = 'QBE+ZPpOBKfVcWoB1wy+ALJJlG5vNVEfGC0yOJ9nf68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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