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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03c4d9a920e4b83deb5c624e90df40d08a8f28d4ecb313c10aa95a34a29a8c3e' 
  AND token = 'o8G5bVKQcrvL9gZybBt8x8GPobLdosnO4TzkplYQG5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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