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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa40af2101b2fa7836d5ea9b9cd63b9fb5e938c3f5a07fc11c0274bd6f51dbe3' 
  AND token = '7yBDyD+sW3YBs//0Ms+BImQeqcFrhs+KNBCobbtDSok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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