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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b1d5a26d5739c0f65cb11e1a259c0d8c4f24ab3cb6858880ca6e4c15f04849e' 
  AND token = 'hdtokqLLKvBq5Kjy1L3NynN5jYwL5rFwIBMxA0nYcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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