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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b69bc1c577783135cb1409f06bfed754c2a8b55bc588df26caa80fff6c6d30e' 
  AND token = 'cdiiLMTK38VxjqhWP6jaol4qvHK4jHdFhI0hBfnthY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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