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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a358a5c3fdc1d87d6c1f78396cdf2d2adb6a1aefcd3a41563632dc0cd33910f' 
  AND token = '+EDfJ0sFb3jk/gtLMfwTqi/0uPBYOW3eg26AS3fTyzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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