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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fad2b4047bc2e6b163e71818b40e58656829b7949d1efb461ec244344ab5160c' 
  AND token = 'RaCkhkFyR5hq+zo3zojbXUJFawRO4rpa3sE+7GlbDzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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