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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e1019480bf488800f4776beabb9298174df53a6543b92bbcf3388c5fc61159a' 
  AND token = 'VX339TnqSbJb9yp6pd/Tk5Z+NyYO3fgdL3V1/4Wc4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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