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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e18426d66ef6f11c261675fe21462b6e3d04c4dcb86b1a5365a0de69e3b6cf5' 
  AND token = 'eF7iKZCAPBk052JZmOLOVPCGSVJjvNLZ3mB02IpaETU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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