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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a4b9d82d020ac50f38d069b31416fd04c7d639ffbf2a8ba2b5e7526c7c6d556' 
  AND token = 'aHGbWWjZTIWoBEAe43XaF9qy7jXGxQtSZPfQ2pCD0kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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