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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9507f63d66edec929388be22e6a6ba333c246de6b5e123f50da1b202b3f67db4' 
  AND token = '13PPpWFQVsr7P1z4nmsgz8+NXf4bVT5xXjkfmWQ6ww4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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