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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a6cacfdf042bcf77ccdcaa3350db7a3becc1b4549c1af1c771644d8caa4b50e' 
  AND token = 'BEh/Vh1urQ2yDFefYLQu/yGjXEP9INSmid3m6PljS9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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