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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5da7a0b432870963f46c14cabf8c2415d893291aab100021a98d5d3b24004c45' 
  AND token = 'RNK3UxhjTJcZ3wCqbM+ay2EiuqSZtZ5FexAVs3nNHdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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