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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766e745d4e2849843513775e1a397922f4794b48733a306a3bda589700477705' 
  AND token = 'foef8wLDoTK4BO45A+3ObRvNw/dQua/uz365e12d6e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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