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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30fdd37cb1ec1f5d380de3534d3cea2ad8355b3dfadeab48789b59af856115d' 
  AND token = 'cQ3yeRhwfrVrYgXJzOwgWiUMgjCMn3JD8qiLImmY6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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