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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b7f9f574eb637fe2e6176d63aa60d17112788cd8063619510e0df9d97f19528' 
  AND token = 'b9S6Bd0Ek6gT6bReGIq49Fz0daMQ8Wn9q1A6gtfLvHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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