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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ba4a1423ebdb5a834eb742d5f67f63b6b0ea0cd3d851b1bd954f1015579e1ba' 
  AND token = 'tO4pIFXUUDCS91JEcW6NROBTre2UzptjLNuxaLdmvwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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