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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd500f74c49887c1f9f26b7cbccfde596c10412326c6c90f9ec908a1dfa501941' 
  AND token = 'CUHGo5buPcQ0wxPdtOdLQlMX82wJJUunH9Wt3p70K7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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