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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7607e6edf71c7f7733ed7c4592eb59baf1fa9853c8153ca90f0baffdd652eacc' 
  AND token = 'U9Y/zr0uBgu70dcGBqJ5tPDdaslBFQmB2oxkj60m1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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