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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba31dc9fcc8032ed1e041c5e0ca3a9e837552ea122d63383c2835c57dccd1ec1' 
  AND token = 'ZkXURWR73vh3np9xwxEyIIwhwBCKcmp7Y2JKTSyDRSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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