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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca64efa091e4ca09988085ea5999292b7c0f2f0a9c2a9b65b40fe1808939599b' 
  AND token = 'Ien59AGJHzFWzCyJxN7tIUo+4/rzMAnra605k0Pzd5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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