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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90b3ae72a14843ecddb9d0a9b78b02b613da6ada1c98556759e80b9bfbed5a3d' 
  AND token = 'S4RZHiQAaPWBh69cH+UJltwev6J1Jc1Zm9IyUkPnpIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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