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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5852517529b76c7ee064527f599734bd06486b4f4b4f5975fdc35320d4630e9c' 
  AND token = 'jmC3A4RJZdTsivSa6W66PskysQKZxPMtRVxxmx7KF3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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