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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e13397fd62388133b77bd7e0e99ec99b6c800ccf8def70b0a78eb1fc108ceab' 
  AND token = 'XmvnpkxEV2ucwp0o9D+oZGYwKNI1GJtgy8HyH0nDI+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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