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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0d460b0f6a04c29092ef0d547ca45747570666b6fad1cf8afc97570e9d5a7e1' 
  AND token = 'GQbXSKzSb1daarJXOqExjzezGjM58fNuycb1bZmEcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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