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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ee802a681495242a2385b6481c8f877a99716a710fa50a5aa16384bd6103809' 
  AND token = '+kv65LYoI16G7PGuqIav6DnhlKO5YqAL5onOhotxGSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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