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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbbc8c794e44b9d5916c46984eeeed0d5e119e0bc4a4d0646d8894ca332c866b' 
  AND token = 'mOtQyQn0V520DlctCoLlQd1MZC9Rc5cRW61EsRwspgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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