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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383c4334d46438c7b1989f7113eb1567f2edfdb195f9f8404790287a90f47519' 
  AND token = 'xwHs3TuMpxggyTPa55A8qtXYxsseaF2UOxDXr4WzcO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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