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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3c231d564824dc4f01f70ce126674cb6d5804d08fe4e4cdfb8812913c1b3eb3' 
  AND token = 'JdrTklzGTq3A6SbLuEN0bs84Y/pn1bnNPrh+kDI4yRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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