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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd37d7932a02b258b8a7f45b26949f380fdc2e12734877deb5adb7cdd911cba1' 
  AND token = 'fXrwL+Ryo6OVAsJQ3eTS74gJQqFEwyBPd6NRPG5f2Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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