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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1887fed726e713280477775de4853bf8b8e06c93c0020970bdfe88fe7aa14cc1' 
  AND token = 'CBUikWZ5MxACwAndAmLpmg1m0HInxssKYrLXMxcTg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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