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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e0c3557b2f5c9a99bb31c99760444b08b3358bded460e52ee070407a92b317a' 
  AND token = 'VA30Z32bFYl89yh+6v8v1ucxSTTy0rZYQhW8BRxWE8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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