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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70b137b0b55caea03360a4e6af004c45b061548b8166c3528a24eb88ae286bca' 
  AND token = 'rBqPAfiws0dSp+DdVaBWtI9JKMO1LLFUmq66k3gai+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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