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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d7ff0124821baa4d1213bdf2b7e025587a3a5c78c28a5f34704910e0244721' 
  AND token = 'aGSrb1LXa86fO1Az+zlTKydCR+gzj85TH1N1tE9W1OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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