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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1db68ec0a30e4510f6915a561066ef8e38f7eae1f388a2a0e4b6ee28d74db5cb' 
  AND token = '9DtH8kPpzc1y7rXe5KIBj+034HZfD7htRkxgXcrwB5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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