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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3662472e602f123e5d8d03fc42facd1e7f0244ebe5675a48a1301e0645e86b00' 
  AND token = '2kyAp+k5mVj2pfNkIMDLL5HXlrHopX0z3xzsUUwFGhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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