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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9983a4b9822ea2a6da2032834622f53a4be56eb43074a40c7ff0ec422033f3ca' 
  AND token = '0y+4s4II8fkCKb553OCJGtkGZHxaDGEkx2jNkyq6Phs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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