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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '947edc0acb5484651d5bdef8a775922cd964049f9b9d6ea8bf462b209b0bb48e' 
  AND token = 'UV2MkuBacLpufj2twu6gPln6Or48V0d8DCW1ObV3b00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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