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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3488eb47edf98cf00465f966e202f223a72c90ecc8624a5d9317d1c67b71f4fc' 
  AND token = 'Wrwi4+XJPeMTC2vbbXOAsOJF7mllS7SCs2FvVZeiVmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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