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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '761c777ea5277c57d66e4af1868de404b005946fee934ee1e71393bc88af9d11' 
  AND token = 'Wi5XJh368HUSJ3rGArzZPbcr6DJV1t1XRbv2qGfPGOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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