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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ece6b4f07559b48ee37ed53e02b98ff2758a4816cd91e4b9dba9a64a2c8b7c70' 
  AND token = 'mwR6foZ5T9kzW5m4S7Zx6KHcX1iSTbo9ux0TpfnOWkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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