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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1db6c0318f66917648dfe9f5c29e508816b0b8db8a31e385d0492d5ad18c02e' 
  AND token = 'HxDpYlqRi9QgRTU4uv0itaIVU1itAquYKCsgZoi1FME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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