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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '538c0f7711ec667d5b14c9e2db7231fda4305cc9c00190041441a11762a81ab3' 
  AND token = 'lcTgI1qMRtDWHR2ULDlgBIOQDaNC3zI6QaZmljk1Nbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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