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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9879850a8b6eb7165529fb020f4d28a97fe74aea8335c7b8312684a82e387460' 
  AND token = 'tdEC6RfO7KJZNyczVn20I3wR1GshoQESyGGxDtj1Oh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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