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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d910c5e84268b84cb4611e792cf870d3ed6ce3fba3d97c0449d0e973702b1d1' 
  AND token = 'mzYydxJzlc1ZlFlWeADHIZRt+gYj6c4yrGdebq6RjbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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