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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af5316e06e472858fec2ae450c78502cab641d49c9afd10daa1d871695eb3064' 
  AND token = '2TTyeQ+2vvP+5IUIshC2wCSPtKPCi5Nk7a7L7ZYcCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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