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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa5480007883a7a056a57834400fe6869c52060b4f2e8c23e311bbdd424e123' 
  AND token = 'gK2rk5Z2vIBbJNerRucP/byv6lGpRWLvtOJILcaWC3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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